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Preparation of lithium ionic secondary cell

A secondary battery and lithium-ion technology, which is applied in secondary battery, electrolyte battery manufacturing, battery electrodes, etc., can solve the problems of poor comprehensive performance and achieve the effect of improving high-temperature storage performance and reducing the loss of irreversible capacity

Inactive Publication Date: 2009-04-29
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defect that the overall performance of the lithium-ion secondary battery in the above-mentioned prior art is relatively poor, and a kind of preparation method of the lithium-ion secondary battery that makes the comprehensive performance of the lithium-ion secondary battery better is provided

Method used

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Examples

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preparation example Construction

[0011] The preparation method of the lithium-ion secondary battery provided by the present invention includes putting the battery pack into the battery casing, and then injecting the electrolyte solution, wherein, the method of injecting the electrolyte solution includes two injections, and the two injections The liquid method includes injecting a part of the electrolyte into the battery casing for a liquid injection, and then temporarily sealing the battery casing for formation; then adding additives to the remaining part of the electrolyte, and then adding the remaining part of the electrolyte and additives inject together into the formed battery case for secondary liquid injection, and the additive is lithium bisoxalate borate.

[0012] According to the method provided by the present invention, in the process of injecting the electrolyte into the battery casing, in order to prevent the additive bisoxalate lithium borate (LiBOB) from making the SEI film thicker during the for...

Embodiment 1

[0020] 1. Preparation of positive electrode

[0021] 60 grams of polyvinylidene fluoride (PVDF) was dissolved in 2000 grams of N-methylpyrrolidone (NMP) solvent to prepare a binder solution, and then 1900 grams of lithium cobaltate (LiCoO 2 ) and 40 grams of acetylene black powder were added to the above solution, fully stirred and mixed to obtain a positive electrode slurry; the positive electrode slurry was evenly coated on both sides of the aluminum foil with a pulper, and dried under vacuum at 150°C for 1 hour. Rolled and cut into pieces to make a positive electrode of 485 mm × 44 mm × 125 microns, each positive electrode contains 8 grams of LiCoO 2 .

[0022] 2. Preparation of negative electrode

[0023] 950 grams of graphite, 20 grams of carbon fiber and 30 grams of styrene-butadiene rubber (SBR) were mixed. Add 1500 ml of water and stir evenly to make a negative electrode slurry, apply it evenly on both sides of the copper foil with a pulper, heat and dry under vacuu...

Embodiment 2

[0030] Lithium-ion secondary batteries were prepared in the manner described in Example 1, the difference was that the amount of electrolyte injected during the first liquid injection was 1.75 grams, and during the second liquid injection, 0.0035 grams of LiBOB was added to 1.7465 grams of electrolyte Mix well, and then pour into the battery case.

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Abstract

The invention relates to a preparation method of a lithium-ion secondary battery. The method comprises: an electrode unit is arranged in a battery shell, and then electrolyte solution is poured in; wherein, the method for pouring the electrolyte solution comprises two times of filling; the method of filling comprises: one part of the electrolyte solution is poured in a battery shell for carrying out one-time filling, then the battery shell is sealed temporarily for carrying out formation; additives are added in the remaining part of the electrolyte solution, then the additives and the remaining part of the electrolyte solution are filled together in the battery shell undergoing formation for two-time filling; the additives are double oxalic acid lithium borate. The lithium-ion secondary battery prepared by the method of the invention satisfactory battery capacity, high-temperature storage performance, low-temperature discharge performance, multiplying power discharging performance and cycle performance.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion secondary battery. Background technique [0002] With the continuous development of the lithium-ion secondary battery industry, the requirements for the comprehensive performance of the battery are getting higher and higher. The comprehensive performance of the battery is reflected in the battery capacity, high temperature storage performance, low temperature discharge performance, rate discharge performance and cycle performance. Factors that affect the overall performance of batteries include electrode materials, battery manufacturing processes, and electrolytes. Therefore, the requirements for the performance of the electrolyte, which is an important part of the battery, are also getting higher and higher. Lithium bisoxalate borate (LiBOB) is a new type of additive in the electrolyte that has emerged in recent years, which can improve the high temperature performance of the battery and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/38H01M10/40H01M2/36H01M4/131H01M4/133H01M10/0525H01M10/0567H01M10/0568H01M10/058H01M10/36H01M50/609
CPCH01M10/058H01M4/133H01M10/0567H01M10/0568Y02E60/122H01M4/131H01M10/0525Y10T29/4911Y02E60/10Y02P70/50
Inventor 范艺韦王凯雷磊曾诚
Owner BYD CO LTD
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